See:

• http://wiki.mozilla.org/Security:Renegotiation

Thank you for your reply, but it doesn't fix my problem as I am running Mac OS 10.6 and don't know how to do this. Can anyone help me or explain how I do this. Thank you.

You can contact that website and ask them to correct this problem.

You can add a domain to the string value of the pref security.ssl.renego_unrestricted_hosts to allow that domain.

See:

• https://wiki.mozilla.org/Security:Renegotiation#security.ssl.renego_unrestricted_hosts

To open the about:config page, type about:config in the location (address) bar and press the "Enter" key, just like you type the url of a website to open a website.
If you see a warning then you can confirm that you want to access that page.
You can use the Filer bar at the top of that page to locate the pref.
You can double click the pref to open the Modify dialog and paste the domain in the value field.

See also:

• http://kb.mozillazine.org/about:config